* {
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
}

img {
    vertical-align: middle;
}

li {
    list-style: none;
}

.header-con {}

header {
    height: 90px;
    background-color: #fff;
    position: sticky;
    top: 0;
}

.header-con {
    width: 1170px;
    height: 90px;
    margin: auto;
    background-color: paleturquoise;
}

header h1 {
    width: 227px;
    height: 90px;
    background-color: cadetblue;
    float: left;
    margin-right: 65px;
}

header nav {
    width: 600px;
    height: 90px;
    background-color: pink;
    float: left;
}

header nav a {
    width: 100px;
    height: 87px;
    line-height: 87px;
    /* border: 1px solid black; */
    display: block;
    float: left;
    text-align: center;
    color: black;
}

header nav .selected {
    color: red;
    border-bottom: 3px solid #e4392a;
}

header nav a:hover {
    color: red;
    border-bottom: 3px solid #e4392a;
}

header .header-con div {
    width: 160px;
    height: 90px;
    background-color: blue;
    float: right;
}

.banner {
    overflow: hidden;
    position: relative;
    height: 526px;
}

.banner img {
    height: 526px;
    /* height: 800px; */
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
}

.aside {
    width: 50px;
    height: 275px;
    background-color: peru;
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
}

main {
    width: 1170px;
    height: 680px;
    margin: auto;
    background-color: purple;
}

main ul {}

main ul li {
    width: 25%;
    /* border: 1px solid black; */
    text-align: center;
    float: left;
}

main li figure div {
    width: 134px;
    height: 134px;
    border: 1px solid black;
    margin: 0 auto;
}

main li:nth-of-type(1) figure div {
    background: url(../img/i_icon1.png);
}

main li:nth-of-type(2) figure div {
    background: url(../img/i_icon1.png) -305px;
}

main li:nth-of-type(3) figure div {
    background: url(../img/i_icon1.png) -615px;
}

main li:nth-of-type(4) figure div {
    background: url(../img/i_icon1.png) -929px;
}

mark {
    background-color: red;
}

footer {
    width: 1170px;
    height: 100px;
    background-color: burlywood;
    margin: auto;
}